/*
 * Copyright 2012 The Netty Project
 *
 * The Netty Project licenses this file to you under the Apache License,
 * version 2.0 (the "License"); you may not use this file except in compliance
 * with the License. You may obtain a copy of the License at:
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations
 * under the License.
 */
package com.wct;

import io.netty.bootstrap.Bootstrap;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.ChannelPipeline;
import io.netty.channel.EventLoopGroup;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.SocketChannel;
import io.netty.channel.socket.nio.NioSocketChannel;
import io.netty.handler.ssl.SslContext;
import io.netty.handler.ssl.util.InsecureTrustManagerFactory;

/**
 * Sends one message when a connection is open and echoes back any received data to the server. Simply put, the echo
 * client initiates the ping-pong traffic between the echo client and server by sending the first message to the server.
 */
public final class EchoClient
{

    static final boolean SSL = System.getProperty("ssl") != null;

    static final String HOST = System.getProperty("host", "120.27.109.100");

    static final int PORT = Integer.parseInt(System.getProperty("port", "4123"));

    public static void main(String[] args)
        throws Exception
    {
        // Configure SSL.git
        final SslContext sslCtx;
        if (SSL)
        {
            sslCtx = SslContext.newClientContext(InsecureTrustManagerFactory.INSTANCE);
        }
        else
        {
            sslCtx = null;
        }

        // Configure the client.
        EventLoopGroup group = new NioEventLoopGroup();
        try
        {
            Bootstrap b = new Bootstrap();
            b.group(group).channel(NioSocketChannel.class)
            // .option(ChannelOption.TCP_NODELAY, true)
            .handler(new ChannelInitializer<SocketChannel>()
                {
                @Override
                public void initChannel(SocketChannel ch)
                    throws Exception
                {
                    ChannelPipeline p = ch.pipeline();
                    if (sslCtx != null)
                    {
                        p.addLast(sslCtx.newHandler(ch.alloc(), HOST, PORT));
                    }
                    // p.addLast(new LoggingHandler(LogLevel.INFO));
                    p.addLast(new EchoClientHandler(12345L));
                }
                });

            // Start the client.
            ChannelFuture f = b.connect(HOST, PORT).sync();

            // Wait until the connection is closed.
            f.channel().closeFuture().sync();
        }
        finally
        {
            // Shut down the event loop to terminate all threads.
            group.shutdownGracefully();
        }
    }
}
